2018 Vernon Smith 2020 Rowena Forest 2016 Steve Matson 2023 Stephanie Penn 2019 Jeffrey Hapeman 2016 Steve Matson 2018 Hunter Breck 2021 Charles Russell 2019 Hunter Breck 2016 Steve Matson 2011 Jeffrey Hapeman 2016 Steve Matson 2016 Steve Matson 2016 Steve Matson 2010 Jesica Peak 2019 Leah Gardner 2019 Jeffrey Hapeman 2019 Jeffrey Hapeman 2019 Jeffrey Hapeman 2019 Hunter Breck
Calochortus tiburonensis is a perennial herb (bulb) that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere).
State of California status: Threatened.
Federal status: Threatened.
[Wikipedia] Description, Conservation, Rarity: Calochortus tiburonensis, the Tiburon Mariposa lily, is a rare member of the genus Calochortus in the family Liliaceae. It is endemic to Marin County, California, where it is known only from one population on Ring Mountain east of Mill Valley. There it occurs on a single serpentine outcrop in grasslands from 50?150 metres (160?490 ft) in elevation.
Calochortus tiburonensis is a perennial growing from a bulb to 10?60 cm in height with a single leaf. It produces anywhere from 2 to 7 erect flowers annually on a branching stem. The ciliate, light yellow-green petals are streaked with purplish-brown. When mature, ovaries form a capsule full of small, dark brown seeds.
The plant was federally listed as a threatened species in 1995. It is considered threatened due to loss of surrounding habitat to recreational activities, to competition from invasive plant species, to its proximity to a dense population center, and to its confinement to a single population of plants. The population grows on land owned by the Marin County Open Space District, an area previously owned and preserved by The Nature Conservancy. It was first brought to the attention of science in 1971, and was described to science in 1973. It is protected along with a number of other rare serpentine soils endemic plants that grow on and around Ring Mountain.
The plant has probably always been rare and limited to its current distribution on the Ring Mountain outcrop. A 1991 estimate placed the total population size at about 40,000 individuals. While the land is protected, the flora upon it are still vulnerable to events such as wildfires or drought, and to damage from off-leash dogs, hikers, cyclists, vandals, and wildflower collectors. (contributed by Mary Ann Machi)
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Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available: